Generate NPC Error

I've been playing Pinstar's Apocalypse challenge and have used the Tree NPC/Townie creator several times in the past few weeks. Last week, I started getting an error only when I tried to generate NPCs. Generating townies and downtownies works fine. The tree will also generate all NPCs at once, but not individually.

I thought this was a problem I was experiencing (turned out to be a fried video card). Right now, I'm running on a really old card, but the game still runs. I also completely reinstalled and patched the game. I figured this would have taken care of the problem. However, I am still receiving the error. Here is my log file. It's too long for the forum, but I included what looked like important bits.

It seems to be saying that it's reading a sim as an object? Any ideas?

Build: 1.4.0.142
at May 25 2006,10:50:02

Object id: 229
name: N010_User00000 - Test
Stack size: 7
Error: Object referred to must be a person.
Iterations: 1
  Frame 6:
   Stack Object id: 167
   Stack Object name: Townie & NPC Maker
   Node: 59
   Tree: id 4110 name 'Generate - Make Character' version -32742
   from TownieNPC_Maker
   Prim state: 0
   Params: 36 8 2 1 Locals: 16 1 2 167 0 0 6230 12108 0 0 1 -19733 28564 0 0
  Frame 5:
   Stack Object id: 167
   Stack Object name: Townie & NPC Maker
   Node: 1
   Tree: id 4101 name 'Interaction - Generate NPC' version -32740
   from TownieNPC_Maker
   Prim state: 0
   Params: 36 Locals: 0
  Frame 4:
   Stack Object id: 229
   Stack Object name: N010_User00000 - Test
   Node: 5
   Tree: id 281 name 'Wait For Notify' version 7
   from global
   Prim state: 1
   Params: 0 1 Locals:
  Frame 3:
   Stack Object id: 229
   Stack Object name: N010_User00000 - Test
   Node: 1
   Tree: id 8282 name 'Function - Main - Check Queue' version 48
   from PersonGlobals
   Prim state: 0
   Params: Locals: 167
  Frame 2:
   Stack Object id: 229
   Stack Object name: N010_User00000 - Test
   Node: 2
   Tree: id 8283 name 'Function - Main - Loop' version 96
   from PersonGlobals
   Prim state: 0
   Params: -5 20 1 Locals: 0
  Frame 1:
   Stack Object id: 229
   Stack Object name: N010_User00000 - Test
   Node: 6
   Tree: id 8193 name 'Function - Main' version 103
   from PersonGlobals
   Prim state: 0
   Params: Locals: -5 20 0
  Frame 0:
   Stack Object id: 229
   Stack Object name: N010_User00000 - Test
   Node: 1
   Tree: id 4096 name 'Function - Main' version 2
   from TemplatePerson
   Prim state: 0
   Params: Locals:

Other Simulator Details:
All Menus On = false
Move Objects On = false

My Object:
Interaction details for Person   N010_User00000 - Test
Current Interaction
Name   Generate EP2 NPC.../Chef
Index   3
TreeID   4101
Initiating Object   -1
Current Icon Object   167
Icon Table Index   0
Icon GUID   0

Attributes:
0, Gender = 2
1, Skin Color = 1
2, Age = 8
3, Last Made ID = 45
4, Last NPC ID = 36
5, Need to Kill or Save? = 0
6, Last Major GUID#1 = 0
7, Last Major GUID#2 = 0
8, Last Special Townie ID = 0
9, Make DownTownies? = 0